31143513366 has 96 divisors (see below), whose sum is σ = 81916922880. Its totient is φ = 8591226336.

The previous prime is 31143513361. The next prime is 31143513371. The reversal of 31143513366 is 66331534113.

31143513366 is a `hidden beast` number, since 31 + 1 + 435 + 133 + 66 = 666.

It is an interprime number because it is at equal distance from previous prime (31143513361) and next prime (31143513371).

It is a self number, because there is not a number n which added to its sum of digits gives 31143513366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143513361) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 268915 + ... + 366881.

It is an arithmetic number, because the mean of its divisors is an integer number (853301280).

Almost surely, 2^31143513366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31143513366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40958461440).

31143513366 is an abundant number, since it is smaller than the sum of its proper divisors (50773409514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31143513366 is a wasteful number, since it uses less digits than its factorization.

31143513366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98043 (or 98008 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The spelling of 31143513366 in words is "thirty-one billion, one hundred forty-three million, five hundred thirteen thousand, three hundred sixty-six".